Mathematics
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    sqrt[(2x)^2-x^2]
    arccos0
    arccos-0.6
    arccos0.6
    arccos0.8
    e3a=8
    (x-20)(-2x+80)
    (252+180)/36
    (252-180)/34
    36*7
    250*0.18
    sqrt(50/0.18)
    1125/(100*sqrt(3))
    1105/(100*sqrt(3))
    2*3.14*40/90
    sqrt(2.25*10*90)
    sqrt(2.25*90)
     7^5/3^5÷7^4/9^4
     7/3^5÷7/9^4
     (7/3)^5÷(7/9)^4

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